/usr/share/octave/packages/3.2/optim-1.0.17/dfxpdp.m is in octave-optim 1.0.17-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | %% Copyright (C) 2010, 2011 Olaf Till <olaf.till@uni-jena.de>
%%
%% This program is free software; you can redistribute it and/or modify
%% it under the terms of the GNU General Public License as published by
%% the Free Software Foundation; either version 2 of the License, or
%% (at your option) any later version.
%%
%% This program is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%% GNU General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License
%% along with this program; If not, see <http://www.gnu.org/licenses/>.
function ret = dfxpdp (varargin)
%% function jac = dfxpdp (x, p, func[, hook])
%%
%% Returns Jacobian of func (p, x) with respect to p with finite
%% differencing. The optional argument hook is a structure which can
%% contain the following fields at the moment:
%%
%% hook.f: value of func(p, x) for p and x as given in the arguments
%%
%% hook.diffp: positive vector of fractional steps from given p in
%% finite differencing (actual steps may be smaller if bounds are
%% given). The default is .001 * ones (size (p));
%%
%% hook.diff_onesided: logical vector, indexing elements of p for
%% which only one-sided differences should be computed (faster); even
%% if not one-sided, differences might not be exactly central if
%% bounds are given. The default is false (size (p)).
%%
%% hook.fixed: logical vector, indexing elements of p for which zero
%% should be returned instead of the guessed partial derivatives
%% (useful in optimization if some parameters are not optimized, but
%% are 'fixed').
%%
%% hook.lbound, hook.ubound: vectors of lower and upper parameter
%% bounds (or -Inf or +Inf, respectively) to be respected in finite
%% differencing. The consistency of bounds is not checked.
%% This is an interface to __dfdp__.m.
if (ischar (varargin{3}))
varargin{3} = @ (p) str2func (varargin{3}) ...
(p, varargin{1});
else
varargin{3} = @ (p) varargin{3} (p, varargin{1});
end
ret = __dfdp__ (varargin{2:end});
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